Ore-screen.



E. A. WALL.

Patented Oct. 17,1911.

cqLuMBu PLANOCIRAPH c0, WASHINGTON, D. c.

ENOS A. VTALL, OF SALT LAKE CITY, UTAH.

ORE-SGBEEN.

rooseor.

Application filed February 28, 1911.

Specification of Letters Patent.

Patented Oct. 17, 1911.

Serial No. 611,431.

To all whom it may concern: 7

Be it known that I, Enos A. VALL, a citizen of the United States,residing at Salt Lake City, in the county of Salt Lake and State ofUtah, have invented certain new and useful Improvements in Ore-Screens,of which the following is a specification.

My invention relates to ore screens.

The object of the invention is to provide a screen especially adaptedfor screening wet ores. 'Io properly screen wet ore it is necessary tofeed the same to the screen mixed with water, or in pulp form, and thetendency of such ores is to adhere to the screen and cake thereon. Itherefore impart to the screen placed at a downward incline, a slowrearward movement and a sudden forward bumping or jarring movement whichwill loosen up any adhering ores and allow the finer particles andwastewater to pass through the screen. This obj ect I accomplish by theconstruction shown in the accompanying drawing, in which Figure 1 is asectional side elevation of an ore screen with my improvements applied.Fig. 2 is a perspective of the screencarrying frame.

A, designates a. suitable base, and B is a screen-supporting frame ofsubstantially triangular form supported by means of vertically extendingsprings A. The frame B is formed of angle-iron and comprises the lowerhorizontal bars 2'), extending lengthwise of the machine, and connectedby transverse bars 6, upper inclined bars 6 supported at their rear endsfrom bars 7), by the uprights b and secured at their lower forward endsto the forward ends of the bars I), by rivets or bolts. The upper andlower bars Z9 b, are braced together by the in clined braces 6 Extendingup from the lower ends of the angle bars 6 are the angle uprights 79 72braced to the cross-bar b, and lower ends of bars 72 and outer ends ofbars Z), by the inclined angle braces 6, b. The space within the flangesof bars 6 6 forms a seat for the screen C, of any suitable construction.

B, B, are brackets secured to the middle portion of bars 5 and bentinwardly at their upper ends to overhang the sides of screen G, wherethey are provided with vertical clamping screws B B which screw down onthe upper side of the screen C, and hold it securely in place. Ofcourse, a number of these screens of different mesh may be placed oneabove the other, if desired, as is usual in screens of this class, but Ihave considered it sufficient to show only one.

To the under side of the frame bars b D is secured an apron D, toconduct the material passing through the screen down to the dischargeend where it is received in a suitable receptacle E, while the materialtoo large to pass through the screen passes down to a separatereceptacle E. The ore mixed with water is fed to the upper end of thescreen from a hopper F, and wash water is supplied over the material onthe screen from a perforated tank G.

G, G, are two rods extending from the front or outer ends of theframebars b, b,

to which they are rigidly connected, back to the middle of the rear endof frame B, where they converge and are provided with a shackle g, towhich is connected the inner end of the operating rod H, passing througha bumper post I, mounted at the rear end of base A. This rod H, isprovided at the inner side of the bumper post I with a projecting-spring J, and an adjusting nut K, for regulating the tension ofthe spring and the force with which it will project the frame B,outwardly. The rod H is provided at the outer side of post I, with abumper collar L and a rubber block L which will suddenly stop theforward movement of the screen-carrying frame B when thrown forward bythe spring J.

The outer end of the actuating rod H passes freely through a tappet M,held firmly against an adjusting nut M, by a strong spring M bearingagainst the inner side of the tappet and against. a collar h, on rod H.By turning the nut M the tappet may be moved, while still held inoperative position to the rotary cam N, and so the length of throw ofthe rod H may be adjusted. The cam N bears on the inner side of thetappet, while the nut M is against the outer side thereof and forms asolid support. The cam is carried by a shaft N mounted in uprights A Aof base A, and provided with a driving pulley N The forward jerk or bumpgiven the screencarrying frame lifts the wet mass suddenly from thescreen, and separates its constituents for action by the wash water andin again settling on the screen in advance of the position it formerlyoccupied the particles small enough will pass through the screen, whilethe over size matter will be moved on down toward the discharge end ofthe screen, and eventually be discharged on a chute B at the lower endof frame B, and delivered at a point beyond the lower discharge end ofthe apron D. As the rods G, G, extend to the front end of the frame B,the force of the jerk or bump will be at the front end of the frame.

What I claim is:

An ore screen comprising a bed, a spring 1 supported screen carryingframe mounted thereon and provided with a screen supporting portioninclined from the head down toward the discharge end of the frame, rodsextending inwardly and rearwardly from the discharge end of the frame, aspring-projected operating rod connected to the converging rear ends ofthe said rods, a bumper post through which said operating rod passes, abumper on the operating rod at the outer side of said postand means forretracting the rod against the action of its spring and suddenlyreleasing it to permit the bumper to strike said post.

In testimony whereof I affix my signature in presence of two witnesses.

EN OS A. WALL. Witnesses A. M. PARKINS, ALBERT POPKINs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents- Washington, D. C.

